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A small birth cohort leaves a long demographic echo

A small birth cohort becomes a smaller group of young adults and, later, potential parents. Even if births per parent recover, the number of people having children may remain different. Following one cohort through time makes the demographic echo easier to see.

5–7 min

Questions you could explore

  • How would migration change the path of the same cohort?
  • Why can total births change even when an average fertility measure stays the same?

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Politics and society

Why are some constitutions so much harder to change than others?

A constitution is meant to outlast the government of the day, yet it also needs a way to adapt when society changes. Some countries require supermajorities in parliament, others demand a national referendum, and a few make certain clauses completely unamendable. Designing an amendment rule means balancing stability against the risk of locking future generations into the past.

4–6 min

Why are some constitutions so much harder to change than others?

Politics and society4–6 minA constitution is meant to outlast the government of the day, yet it also needs a way to adapt when society changes. Some countries require supermajorities in parliament, others demand a national referendum, and a few make certain clauses completely unamendable. Designing an amendment rule means balancing stability against the risk of locking future generations into the past.

Politics and society

How ranked-choice voting turns second choices into winners

Ranked ballots can transfer when a candidate is eliminated; some proportional systems also transfer surplus votes after a candidate is elected. A ranking can therefore matter beyond the first choice. Explore how different counting rules use those preferences, rather than assuming every ranked-choice system follows the same procedure.

5–7 min

How ranked-choice voting turns second choices into winners

Politics and society5–7 minRanked ballots can transfer when a candidate is eliminated; some proportional systems also transfer surplus votes after a candidate is elected. A ranking can therefore matter beyond the first choice. Explore how different counting rules use those preferences, rather than assuming every ranked-choice system follows the same procedure.

Politics and society

How do you select a citizens’ assembly without holding an election?

How could a group of ordinary citizens broadly reflect a country without running for office? Citizens' assemblies can use civic lotteries, or sortition, to invite randomly selected people and then select from volunteers against demographic criteria. The result aims for a cross-section of the population rather than an elected chamber or an unrestricted sign-up list.

4–5 min

How do you select a citizens’ assembly without holding an election?

Politics and society4–5 minHow could a group of ordinary citizens broadly reflect a country without running for office? Citizens' assemblies can use civic lotteries, or sortition, to invite randomly selected people and then select from volunteers against demographic criteria. The result aims for a cross-section of the population rather than an elected chamber or an unrestricted sign-up list.

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